Answer: 16 + 200 = 216
Step-by-step explanation:
if the mean is 70 minutes, then 90 minutes is 2 standard deviations above 70. if you look at the bell curve i drew, the percent of exams that took over 90 minutes is 2.5%
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Step-by-step explanation:
interest:

Total=500+30=530
2p^2 + 30p + 108 2(p + 6)(p + 9)
----------------------- = -------------------- = 2(p + 9) / (p - 1)
p^2 + 5p - 6 (p + 6)(p - 1)
Its the first choice